Part 1 - Origins. The first spawn is on the white box before the first door you open. The second spawn is on the wall on the left right after the first door is opened up top. The final spawn is in the Generator Station 3 and it is on a chair on the wall, to the right of the entrance.
Part 2 - Verruckt - Spawn once is once you enter on the backside of the red and white column when you are facing the wall-buy and the door. Spawn two is up the stairs in the back room on the chair on the left side. Final spawn is on the island in the kitchen at the upper level.
Part 3 - Der Eisendrache - Turn on low gravity in the pyramid room by standing on the fours tiles on the floor. The first spawn is on the top of the one wall in between the arch on the wall in the middle of the walkways with four sides. The second spawn is on the top of the other side of that same wall. The other is on the side of one of the walls with the eyes. (Easier to figure out through the video)
Craft - Go to Nacht Der Untoten and go to the upstairs and there will be a buildable bench.